Hexagonal 2-dimensional reflection phase grating diffuser

Abstract

A hexagonal two-dimensional reflection phase grating diffuser includes a plurality of wells that are either part hexagonal or fully hexagonal in cross-section. The depths of the respective wells are determined through calculation of a number theory sequence such as a quadratic residue number theory sequence, a primitive root sequence, or a Chinese remainder theorem. The diffuser may be located within a listening room oriented with openings in the wells facing either downward or horizontally.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a hexagonal 2-dimensional reflection phase grating diffuser. Sound diffusers described thus far in the patent literature have included single plane devices, for example, those disclosed in U.S. Pat. No. D291,601 to D'Antonio et al. and U.S. Pat. No. 4,821,839 to D'Antonio et al. They cause scattering into a hemi-disc, acting as a plane surface in the other directions. While this is the preferred diffuser design for some applications, there is a need for a diffuser that scatters into a hemisphere.[0002]For a Schroeder diffuser this can be achieved by forming a two-plane device, often referred to as a 2D diffuser. This device scatters optimally in the x- and z-direction, and therefore gives even lobes on a hemisphere. Examples include U.S. Pat. No. D306,764 to D'Antonio et al., U.S. Pat. No. 5,401,921 to D'Antonio et al., and U.S. Pat. No. 5,817,992 to D'Antonio. All of these devices have been based on orthogonal design...

AI Technical Summary

Benefits of technology

[0014]It is a further object of the present invention to provide such a diffuser that

Problems solved by technology

Comb filtering causes serious deterioration of perceived sound quality and makes it impossib

Images